from flask import abort, jsonify
from flask import current_app
from flask import g
from flask import render_template
from flask import request
from flask import session

from info import db
from info.models import News, Category, User, Comment, CommentLike
from info.utils.common import user_login_data, follow_action
from info.utils.response_code import RET
from . import news_blu


# 路由的装饰器要放在最上面
@news_blu.route('/<int:news_id>')
@user_login_data
def news_detail(news_id):
    """
    新闻详情页
    :param news_id:
    :return:
    """
    # 查询用户登录信息
    user = g.user

    # 右侧的新闻排行的逻辑
    news_list = []
    try:
        # 查询对象 order_by(News.clicks.desc())浏览量的倒序排序
        news_list = News.query.order_by(News.clicks.desc()).limit(6)
    except Exception as e:
        current_app.logger.error(e)
    # 定义一个空的字典列表,每一个字典元素放news的信息
    news_dict_li = []
    # 遍历对象列表,将对象的字典添加到字典列表中
    for news in news_list:
        news_dict_li.append(news.to_basic_dict())

    # 查询新闻数据
    news = None

    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)

    if not news:
        # 报404错误,后续统一处理
        abort(404)

    # 查询文章的作者
    author = None

    try:
        author = User.query.get(news.user_id)
    except Exception as e:
        current_app.logger.error(e)

    # 更新新闻的点击次数
    news.clicks += 1

    # 判断用户是否收藏
    is_collected = False
    # 是否关注作者
    is_followed = False

    if user:
        # 判断用户是否已收藏新闻
        # user.collection_news是user的relationship关联的news对象
        if news in user.collection_news:  # lazy,此处的in user.collection_news也会触发,可以后接all()
            # user.collection_news.all()
            is_collected = True
        # 判断是否有作者
        if author:
            # 判断是否关注作者
            if author in user.followers:
                is_followed = True

    # 去查询评论数据
    comments = []
    try:
        comments = Comment.query.filter(Comment.news_id == news_id).order_by(Comment.create_time.desc()).all()
    except Exception as e:
        current_app.logger.error(e)

    # 查询评论点赞情况
    comment_like_ids = []
    if g.user:
        try:
            # 需求：查询当前用户在当前新闻里面都点赞了哪些评论
            # 解释:
            # 第一步,查出当前新闻的所有的评论的id
            # 第二步,查询当前用户的所有的点赞
            # 第三步,取点赞和评论的交集,得到当前新闻中当前用户的点赞的评论
            # 1. 查询出当前新闻的所有评论 ([COMMENT]) 取到所有的评论id  [1, 2, 3, 4, 5]
            comment_ids = [comment.id for comment in comments]
            # 2. 再查询当前评论中哪些评论被当前用户所点赞 （[CommentLike]）查询comment_id 在第1步的评论id列表内的所有数据 & CommentList.user_id = g.user.id

            # 取到所有的符合要求的点赞查询对象,条件:1.点赞属于当前新闻的某一评论的,2.点赞属于当前用户的
            comment_likes = CommentLike.query.filter(CommentLike.comment_id.in_(comment_ids),
                                                     CommentLike.user_id == g.user.id).all()
            # 3. 取到所有被点赞的评论id 第2步查询出来是一个 [CommentLike] --> [3, 5]
            # 通过点赞对象取到他们身上的评论的id,即这些评论就是被当前用户点了赞的
            comment_like_ids = [comment_like.comment_id for comment_like in comment_likes]  # [3, 5]
        except Exception as e:
            current_app.logger.error(e)

    comment_dict_li = []
    for comment in comments:
        comment_dict = comment.to_dict()
        # 代表没有点赞
        comment_dict["is_like"] = False
        # 判断当前遍历到的评论是否被当前登录用户所点赞
        if comment.id in comment_like_ids:
            comment_dict["is_like"] = True
        comment_dict_li.append(comment_dict)

    data = {
        "user": user.to_dict() if user else None,
        "news_dict_li": news_dict_li,
        'news': news.to_dict(),
        'is_collected': is_collected,
        'comments': comment_dict_li,
        'author': author.to_dict() if author else None,
        'is_followed': is_followed
    }

    return render_template('news/detail.html', data=data)


@news_blu.route('/news_collect', methods=["POST"])
@user_login_data
def collect_news():
    """
    收藏新闻
    :return:
    """

    user = g.user
    if not user:
        return jsonify(errno=RET.SERVERERR, errmsg='用户未登录')

    # 1.接受参数
    news_id = request.json.get("news_id")
    action = request.json.get("action")

    # 2.判断参数
    if not all([news_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')

    if action not in ['cancel_collect', 'collect']:
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')

    try:
        news_id = int(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')
    pass

    # 3.查询新闻,并判断新闻是否存在
    news = None
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DATAERR, errmsg='数据查询错误')

    if not news:
        return jsonify(errno=RET.NODATA, errmsg='未查询到新闻')

    # 4.收藏
    if action == 'cancel_collect':
        # 取消收藏
        if news in user.collection_news:
            # 删除用户的新闻收藏列表中的此新闻
            user.collection_news.remove(news)
    else:
        if news not in user.collection_news:
            # 添加到用户的新闻收藏列表
            user.collection_news.append(news)

    return jsonify(errno=RET.OK, errmsg='操作成功')


@news_blu.route('/news_comment', methods=["POST"])
@user_login_data
def comment_news():
    """
    评论新闻或者回复某条新闻下指定的评论
    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SERVERERR, errmsg='用户未登录')

    # 1.取到参数
    news_id = request.json.get("news_id")
    comment_content = request.json.get("comment")
    # 父评论,标识所属,自关联一对多
    parent_id = request.json.get("parent_id")

    # 2.判断参数
    if not all([news_id, comment_content]):
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')

    try:
        news_id = int(news_id)
        if parent_id:
            parent_id = int(parent_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')

    # 查询新闻,并判断新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DATAERR, errmsg='数据查询错误')

    if not news:
        return jsonify(errno=RET.NODATA, errmsg='未查询到新闻')

    # 3.初始化一个评论模型
    comment = Comment()
    comment.user_id = user.id
    comment.news_id = news_id
    comment.content = comment_content
    if parent_id:
        comment.parent_id = parent_id

    # 添加到数据库
    #
    try:
        db.session.add(comment)
        # 手动提交是因为后面马上要把comment的数据库模型发送给前段
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()

    return jsonify(errno=RET.OK, data=comment.to_dict())


@news_blu.route('/comment_like', methods=["POST"])
@user_login_data
def comment_like():
    user = g.user
    if not user:
        return jsonify(errno=RET.SERVERERR, errmsg='用户未登录')

    # 1.取到参数
    comment_id = request.json.get("comment_id")
    action = request.json.get("action")

    # 2.判断参数
    if not all([action, comment_id]):
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')

    if action not in ["add", "remove"]:
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    try:
        comment_id = int(comment_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')

    # 3.查询评论
    try:
        comment = Comment.query.get(comment_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DATAERR, errmsg='数据查询错误')
    # 判断查询结果
    if not comment:
        return jsonify(errno=RET.NODATA, errmsg='评论不存在')

    if action == "add":
        comment_like_model = CommentLike.query.filter(CommentLike.user_id == user.id,
                                                      CommentLike.comment_id == comment.id).first()
        # 判断是否已经点赞了
        if not comment_like_model:
            # 点赞评论
            comment_like_model = CommentLike()
            comment_like_model.user_id = user.id
            comment_like_model.comment_id = comment.id
            db.session.add(comment_like_model)
            comment.like_count += 1

    else:
        # 取消点赞评论
        comment_like_model = CommentLike.query.filter(CommentLike.user_id == user.id,
                                                      CommentLike.comment_id == comment.id).first()
        if comment_like_model:
            db.session.delete(comment_like_model)
            comment.like_count -= 1

    try:
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()
        return jsonify(errno=RET.DBERR, errmsg="数据库查询错误")

    return jsonify(errno=RET.OK, errmsg="操作成功")


@news_blu.route('/follow', methods=["POST"])
@user_login_data
def follow():
    user = g.user
    if not user:
        return RET.SESSIONERR, '用户未登录'

    errno, errmsg = follow_action(user)

    return jsonify(errno=errno, errmsg=errmsg)

